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Q.

The fourteen elements collectively placed in group 3 (or IIIB) and period are called

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a

d- block element

b

p-block elements

c

s-block elements

d

Actinides

answer is D.

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Detailed Solution

IIIB and 7^th period elements have 5f orbitals filled by differentiating electron, hence they are actinides.

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